CRITICAL AIRFIELD MARKINGS.

SEC. 146. CRITICAL AIRFIELD MARKINGS. Not later than 180 days after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall issue a request for proposal for a study that includes— (1) an independent, third-party study to assess the durability of Type III and Type I glass beads applied to critical markings over a 2-year period at not fewer than 2 primary airports in varying weather conditions to measure the retroreflectivity levels of such markings on a quarterly basis; and (2) a study at 2 other airports carried out by applying Type III glass beads on half of the centerline and Type I glass beads to the other half and providing for assessments from pilots through surveys administered by a third party as to the visibility and performance of the Type III glass beads as compared to the Type I glass beads over a 1-year period.